Syringe



A.l E. SMITH Jan. 1, 1946.

SYRINGE Fild Feb. 24, 1945 2 sheets-sheet 1 Il! tzt w, m n

n m# E l MM 5.\ E ou w d m 2 f. 3 A t l WA Jan. l,l 1946. A. E. SMITH2,392,196

sYRINGE Filed Feb. 24, 1945 2 sheets-sheet 2 L l I l` l, l 30 me/@Q10 AINyENToR. BYARTHUR E S/ygfm Aff omc Patented Jan. 1, 1946 U NITED STATES PATENT O FFICE l2,392,196 sYniNGE Arthur Ed Smith, Los. Angeles,vCalif..

Application February 24, 1945,. Serial No. 579,663'

1 claim. (prize-aix) syringe including" a barrel and including a pivoted closure wherein novel-means is provided for holding the closure inclosed position.

A further object of the invention is to provide a syringe with a barrelhaving an am'puIetherein with a cork in the ampule which contains adrug, and wherein the barrel includes a novel pivotaliy mounted frontmember which is movable to cause release of a drug in the ampule cork.

Other objects and the advantages of my invention will be apparent fromthe following description taken in connection with the accompanyingdrawings, wherein:

Fig. 1 is a central, sectional view showing a syringe embodying thefeatures of my invention;

Fig. 2 is a fragmentary view of the syringe similar to Fig. 1, showingthe front member partly closed;

Fig. 3 is a view similar to Fig. 2, showing the front member in morefully closed position;

Fig. 4 is a view similar to Fig. l, showing the front member in fullyclosed position;

Fig. 5 is an end View of the barrel, with the front member removed;

Fig. 6 is an end view of the syringe iront member removed from thebarrel;

Fig. 7 is a plan view of the iront member holding dog;

Fig. 8 is a side elevation of the front member holding dog;

Fig. 9 is a plan view of the ampule holding dog, and

Fig. 10 is a front elevation of the ampule holding dog.

Referring to the drawings by reference characters, I have shown myinvention as embodied in a syringe which is indicated generally at III.As shown the syringe includes a barrel II having an enlarged ellipticalfront end I2 and a cylindrical portion I3. The rear portion I3 is closedas at I4 and the closed end is provided with a hole I5 through which aplunger I6 extends.

The plunger I6 is provided with a hand engaging portion I'I at its outerend and at its inner end includes a head` [8. A sleeve. lll is slidableon the plunger and is. engaged by the inner end of the spring 20. The.outer end of the. spring 20 engages the inner wall oi the end I4 of thebarrel.

My improved syringe is particularly adapted for use in the preparationof fresh anaethetizing solutions and. is adapted for use with ampuleswhich may be the typel shown in my prior Patent No. 2,337,354, grantedDecember 21, 1942.v Inthe disclosure the ampule designated at 2.0' has apiston stopper 2| at the inner end which 'is adapted to be engaged bythe plunger head [8 and to be forced inwardly alongthe ampule to expelthe contents thereof.

At the forward end of the ampule I provide a stopper 22 which isprovided with a diaphragm 23 and with a cavity 24 in which a medicinaltablet 25 is arranged. The inner end of the cavity 24 is closed by aclosure 2B which is in the nature of a disc and which normally .Seals inthe drug 25 so that it will not be reached by. the liquid vehicle withinthe ampule 2Dfuntil the closure 26 is dislodged.

The forward end of the front portion I2 is provided with a slot 30 inwhich a finger 3| on a iront member 32 is inserted and is pivotallymounted by means of a pin 33. The closure 32 includes an outer endportion 34 which is adapted to be' engaged by hypodermic needle support35. The front member includes a hole 36 which communicates with a tube31 which projects inwardly beyond a shoulder 38 on the closure 32.

The construction is such that when the closure 32 is moved towardsclosed position it lirst assumes the position shown in Fig. 2, whereinthe diaphragm 23 is engaged by the tube. As the closure moves towardscompletely closed position the diaphragm will be broken and the tubewill engage the closure 26 as shown in Fig. 3. Further movement of theclosure will cause the disc closure 26 to be unseated as shown in Fig.4. This act allows the drug to enter the vehicl and prepare a freshsolution. y

To hold the ampule 20 in the barrel while the closure is being moved toclosed position, I pro-f vide a dog 40 which has a projection 4I at thefront end and this projection is positioned to.

engage the forward end of the ampule 20' as shown in Figs. 1, 2 and 3.When the closure 32 is moved to fully closed position the projection 4Iis received in a recess 43 in the closure 32 and the projectionSB on theclosure 32 engages the end of the ampule 20 and causes it to moveslightly inwardly. In this way there is a large contacting area for theiront end of the ampule f2 i j i Y and the latter is not likely to breakas would be they case if only the dog portion 4| engaged the ampuleduring the time the piston cork 2| is 'l moved forwardly.

To hold the closure 32 in closed position, I prov Y vide a dog 45. Thedogs 40 and 45 are coaxial and are mounted on a pivot pin 46. The dog 40is U-shaped, as shown in Fig, 10, while the dog 45 is of a singlethickness and ts between the sides of the U-shaped dog. The dog 45includes a tongue 41 'which engages a tongue 48 on the Y Y front member32 when the latter isk closed.

In the use of my improved syringe an ampule is inserted in theY barreland is moved to the posi- Y tion shown in Fig.V 1, where it is held bythe dog 40. The closure 32 is then moved to closed position and as itmoves the tubeV 31 moves inwardly and engages the diaphragm 23 ,(FigrZ).Then thel tube breaks or pierces the Vdiaphragm (Fig. 3) Then the tubedislodges the closure 25 to i :pause the drug 25 to beexposed in thestopper To discharge the ampule and reload the syringe thevdogV 45 isrst depressed, This causes the closure l32 to be moved by a spring 5I toopen position. VThereupon the dog 40'is. moved outwardly and theampuleis ejected by action of the spring 2U. Y

The dog 40 is arranged inra slot 60 Ywhich is slightly wider than thethickness of the dogV so 'that a spring 5| maybe arranged about. the pin446 at one side of the dog 40. One end of the spring is bent to iit in aholein the Vdog 40 and the other Yerld of the spring is bent to fit in ahole in the Adog 45V and the spring normally urges the dog 45 outwardlyand the dog 40 inwardly.

Vaeaaloo 'Y A spring normally urges the front member to open position.

- 1t will be noteathat the dog 4o cannotlaeV moved outwardly so long asthe front member is in closed position and this dog cannot therefore bereleased until the front member is open.

Thus premature ejection of the ampule from the barrel before the tube 31has Vmoved from the ving sleeve slidable on the'plulflger,v spring meansnormally urgingthe ampule engaging sleeve forwardly in the barrel, apivoted dog on the front 'end of s-aid barrel, said dog having aprojection thereon, an ampule in said'b'arrel and engaged by Ysaidprojection,` Ysaid ampule having a cork therein adjacent said dog, saidcork havingr a drug holding cavity therein, a closure for'saidcork'cavity, a front member pivotally mounted on said barrel, said frontmember having aV tube projecting therefrom and movable into the barrelVfor the purpose of shifting said cork cavity closure when the frontmember is moved to closed position, a second dog pivoted on said barrel,said front member having a projection thereon engaging said second dog,said front member having a recess therein receiving said flrst dog whenthe front member is closed, said front member having a shoulder portionthereon which engages the end of the ampule and forces the ampule intothe barrel and away from the first dog when the front member is closed,and spring means urging said dogs to engaging position.

ARTHUR la, slvrlTH. Y

